When a catalyst is added to a reaction mixture a. The reaction rate decrease b.

Question

When a catalyst is added to a reaction mixture a. The reaction rate decrease b. Activation energy of the reaction decrease c. Activation energy of the reaction increase d. The sign of DeltaH flips 13. The unit for the rate constant of a second order reaction is: a. mol/(L.s) b. L^2/(mol^2.s) c. L/(mol.s) d. I/s 14. Which of the following statements arc TRUE? a. Dynamic equilibrium occurs when the rate of the forward reaction equals the rate of the reverse reaction. b. The equilibrium constant for the forward reaction is equal to the equilibrium constant for the reverse reaction. c. Dynamic equilibrium indicates that the amount of reactants and products are equal. d. All of the above are true. 15. Elementary reactions that involve the reaction of two molecules that may or may chemically distinct are called a. Unimolecular reactions b. Elementary reactions c. Bimolecular Reactions d. Double replacement reactions 16. Calculate the value of [N_2]_eq if [H_2]_eq = 2.0 M, [NH_3]_eq = 0.5 M, and K_c = 2. N_2(g) + 3 H_2(g) 2 NH_3(g) a. 0.031 M b. 0.062 M c. 0.016 M d. 0.40 M 17. The rate determining step is a. The slowest elementary reaction b. The fastest elementary reaction c. Can only be determined with concentrations of reactants and initial rate d. Cannot be determined

Explanation / Answer

Ans12) When a catalyst is added to a reaction mixture : Activation energyof the reaction decreases.

Ans 13) The unit for the rate constant of a second order reaction is: L/(mol.s)

Ans 14) a) Dynamic equilibrium occurs when the rate of forward reaction equals the rate of reverse reaction

Ans 15) Elementary reaction that involve the reaction of two molecules that may or may not chemically distinct are called Bimolecular Reactions

Ans 16) [N2]= [NH3]2/Kc. [H2]3=(0.5)2/2x(2)3=0.25/16 =0.016 M.

Ans: 17) The rate determining step is the slowest elementary reaction.

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